to do a 180
[do] a (one|) hundred (and|) eighty[do] a one eighty[do] a one-eightyto do a 180
01
to completely change one's attitude or opinion about something, often in a surprising or dramatic way
例
The company did a 180 and decided to focus on a different market.
After hearing the new facts, he did a 180 on his earlier decision.
